Submission #810208

#	Time	Username	Problem	Language	Result	Execution time	Memory
810208		boyliguanhan	Painting Walls (APIO20_paint)	C++17	100 / 100	1408 ms	24056 KiB

paint

#include "paint.h"

#include <bits/stdc++.h>
using namespace std;
unordered_map<int,int> lseg1,lseg2;
vector<int> liked_by[200100];
int dp[200100]{}, valid_i[200100]{};
int minimumInstructions(int N, int M, int K, vector<int> C, vector<int> A, vector<vector<int>> B) {
    for(int i = 0; i < K; i++) liked_by[i].clear();
    multiset<int> st;
    for(int i = 0; i < M; i++)
        for(int color: B[i])
            liked_by[color].push_back(i);
    for(int i = N; i--;) {
        for(auto j: liked_by[C[i]]) {
            lseg1[j] = 1+lseg2[(j+1)%M];
            if(lseg1[j]>=M) valid_i[i]=1;
        }
        swap(lseg1, lseg2);
        if(i<N-1)
            for(auto j:liked_by[C[i+1]])
                lseg1[j]=0;
    }
    for(int i = 0; i < M; i++) st.insert(0);
    for(int i = N; i--;) {
        dp[i]=1e9;
        if(valid_i[i])
            dp[i] = 1+*st.begin();
        st.insert(dp[i]);
        st.erase(st.find(dp[i+M]));
    }
    return (dp[0]<1e9?dp[0]:-1);
}

• Subtask 1: 12 / 12
• Subtask 2: 15 / 15
• Subtask 3: 13 / 13
• Subtask 4: 23 / 23
• Subtask 5: 37 / 37